docs: def monitor_key_set(service, key, value):
      """
      Sets a key value pair on the monitor cluster.
      :param service: six.string_types. The Ceph user name to run the command under
      :param key: six.string_types.  The key to set.
      :param value: The value to set.  This will be converted to a string
          before setting
      """
      try:
          check_output(
              ['ceph', '--id', service,
               'config-key', 'put', str(key), str(value)])
      except CalledProcessError as e:
          log("Monitor config-key put failed with message: {}".format(
              e.output))
          raise